I have just finished reading (well listening to) this today. Really enjoyed it.
But, Jetta's pregnancy, we are led to believe that it was the constables baby. But when the mother died Roddy said that Jetta stopped sleeping with the children and started to sleep with the father instead because she needed privacy now. I distinctly remember that because dd1 walked in to the room as it was said and I switched it off quickly incase it led somewhere she shouldn't hear.
So could it have been the fathers baby?
and when Roddy walked in on Jetta and lachlan he seemed not to be sure what was going on. But he would have known surely, growing up around animals like he did? Did he say this to seem more innocent than he was and to downplay the sexual element of the crime?